Five-section type water stop screw and construction method thereof

Abstract

The invention discloses a five-section type water stop screw and a construction method thereof. The five-section type water stop screw comprises a main screw, a connecting rod, an outer rod, a waterproof rubber sleeve and a fastener, wherein a water stop piece is fixed in the middle of the main screw; the two sides of the main screw are sequentially and spirally connected with the connecting rod and the outer rod; two ends of the main screw are provided with external threads, the internal threads at two ends of the connecting rod are opposite in direction, and the external threads of the outer rod are opposite to the external threads of the main screw in direction. The water stop screw can be recycled to the maximum extent, and building materials are saved; the used water stop piece can increase the water contact area, change the permeation path of water and enhance the water stop effect; the arrangement of the expansion water stop gasket can achieve a secondary water blocking effect, and the use of the waterproof rubber sleeve can effectively avoid the problem of water leakage caused by cracking of concrete near the screw hole in the later period of the basement outer wall.

Description

Technical Field

[0001] The invention relates to a building material and a construction method, in particular to a five-section water-stopping screw and a construction method thereof. Background Art

[0002] With the development of construction technology, the water seepage situation of the exterior walls of building basements is still not optimistic. It takes a lot of manpower and money to repair the leaking parts of the exterior walls of building basements. During the template removal stage after the concrete pouring is completed, the traditional water-stop screws need to use a cutting machine to cut off the outer rods at both ends, which wastes a lot of steel and labor, and the construction method will damage the wall. There are certain disadvantages and cannot meet the needs. The combined water-stop screws currently used still cannot be mostly dismantled and recycled, resulting in material waste. At the same time, there is still a problem of water seepage at the screw holes on the exterior walls of the basement. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a five-section water-stop screw which is recyclable, saves building materials and has good water-stopping effect; another purpose of the present invention is to provide a construction method for a five-section water-stop screw.

[0004] Technical solution: The five-section waterstop screw described in the present invention includes a main screw with a waterstop plate fixed in the middle, connecting rods and outer rods spirally connected on both sides of the main screw in sequence, as well as a waterproof rubber sleeve for sealing and supporting the formwork and fasteners of the formwork; both ends of the main screw have external threads, the internal threads at both ends of the connecting rod are in opposite directions, and the external thread direction of the outer rod is opposite to that of the main screw.

[0005] Furthermore, the surfaces of the main screw and the water stop plate have a waterproof coating.

[0006] Furthermore, the middle portion of the main screw is bent and arched upward; the formation of the arch can change the water penetration path and has a better water blocking effect.

[0007] Furthermore, the edge of the water stop plate is bent and extended toward the water facing surface, and the shape of the water stop plate is bowl-shaped, umbrella-shaped or overall corrugated, thereby increasing the contact area between the water stop plate and the concrete and better blocking water.

[0008] Furthermore, a plurality of recessed parts are arranged on one side of the water-facing surface of the water-stopping piece. Hammer patterns are processed on the surface of the water-stopping piece to increase the contact area between the water-stopping piece and the concrete and better block water.

[0009] Furthermore, an expansion water-stop gasket is provided on the back-to-water side of the water-stop plate and waterproof material is filled between the two; the expansion water-stop gasket absorbs water and expands when it comes into contact with water, thereby playing a further water-blocking role and effectively preventing wall leakage.

[0010] Furthermore, the waterproof rubber sleeve has an internal thread matching the outer rod. When screwed to the outer rod, the waterproof rubber sleeve, like the expansion tube of the expansion screw, expands to generate friction and grip force, deforms to fit tightly against the inner wall of the template, effectively seals the gap between the template and the screw hole, prevents leakage of mortar and cement during concrete pouring, can better fix the template, reduce displacement and damage of the template during concrete pouring, and thus increase the service life of the template.

[0011] Furthermore, the fastener includes a mountain-shaped clamp for fixing the steel pipe, a steel pipe and a fastening nut.

[0012] The construction method of a five-section water-stop screw described in the present invention comprises the following steps:

[0013] (a) Open screw holes on the template according to the screw hole arrangement requirements;

[0014] (b) Connect the connecting rods on both sides to the main screw rods respectively, then put the waterproof rubber sleeve part on the connecting rods, insert the outer rods from the templates on both sides into the screw holes, penetrate the waterproof rubber sleeve and connect with the connecting rods by thread;

[0015] (c) When pouring concrete, avoid the water-stop screw;

[0016] (d) After the concrete strength reaches the construction requirements, the formwork and waterproof rubber sleeve are removed, and the torque in the same direction as the tightening direction of the outer rod thread is applied to release the connection between the connecting rod and the main screw;

[0017] (e) Use micro-expanding waterproof mortar to seal the screw hole. When the waterproof mortar on the outside of the screw hole solidifies, apply cement-based penetrating crystalline waterproof coating around the hole.

[0018] Furthermore, when the concrete strength reaches 50% to 60% in step (d), demolition construction is started from bottom to top.

[0019] Working principle: The waterstop screw uses a threaded connection to form a through-wall tension support and tightening effect on the formwork on both sides. The connecting rod and the outer rod are revolving screws, and the connecting rod with opposite internal threads at both ends is used. When dismantling, a torque in the same direction as the outer rod spiral is applied to make the outer rod and the connecting rod more tightly screwed, while releasing the screw connection between the connecting rod and the main screw, and then the outer rod and the connecting rod are recycled to achieve the purpose of saving materials; when the waterproof rubber sleeve with internal threads is screwed to the outer rod, it is deformed and fits tightly to the formwork, playing a good sealing and supporting role; the waterstop sheet arranged on the waterstop screw is in the shape of a corrugated shape or the edge is bent toward the water surface, which increases the contact area with water and can further block water; the middle part of the main screw in the wall is arched upward, changing the water penetration path, and has a better water blocking effect.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant characteristics: maximum recycling of water-stop screws and saving of materials; enhanced water-stopping effect; and effective avoidance of water leakage problems in the basement exterior wall due to cracking of concrete near the screw holes in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the construction effect of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention;

[0023] Figure 3 It is a deformation diagram of the waterproof rubber sleeve 5 of the present invention;

[0024] Figure 4 It is a schematic diagram of the threaded connection among the outer rod 4, the connecting rod 3 and the main screw 1 of the present invention. DETAILED DESCRIPTION

[0025] In the following examples, the materials and reagents used are all commercially available unless otherwise specified. Experimental methods without specific conditions in the examples are usually carried out under conventional conditions or under conditions recommended by the manufacturer.

[0026] like Figure 1 As shown, the five-section waterstop screw includes a main screw 1 with a waterstop plate 2 fixed in the middle part, and a waterproof coating is applied on the surface of the main screw 1 and the waterstop plate 2 to prevent water penetration and corrosion. The waterstop plate 2 is extended with its edge bent toward the water-facing surface. Specifically, the waterstop plate is in a corrugated shape with its edge bent toward the water-facing surface, thereby increasing the contact area between the waterstop plate 2 and water, thereby preventing water penetration. The middle part of the main screw 1 where the waterstop plate 2 is located is bent upward to form an arch shape. Therefore, the waterstop plate 2 and the main part of the waterstop screw are not on the same horizontal line, which changes the water penetration path and has a better water-stopping effect. Both ends of the main screw 1 have external threads, and the connecting rod 3 is respectively connected to the threads at both ends of the main screw 1, and the outer rod 4 is respectively connected to the connecting rod 3 with threads, and the thread direction of the outer rod 4 is opposite to the thread direction of the main screw 1, and the internal threads at both ends of the connecting rod 3 are opposite. As shown Figure 4As shown, specifically, the external thread at the end of the outer rod 4 is a right-handed thread, the internal thread at one end of the connecting rod 3 connected to the outer rod 4 is a right-handed thread, and the internal thread at the other end connected to the main screw 1 is a left-handed thread, and the external thread at the end of the main screw 1 is a left-handed thread. Considering that the stress concentration area mainly appears at the root of the thread and the contact surface of the internal and external threads of the connecting structure during the loading process of the connecting structure. When the number of thread engagement teeth n=4, due to the small number of engagement teeth of the nut, the stress bearing of each thread is relatively uniform, and the thread bearing stress value near the top of the nut is slightly larger. When the number of engagement thread teeth is the same, the size of the pitch has little effect on the stress distribution when the connecting structure is loaded. Finally, the number of thread engagement teeth is n=4 and the pitch is p=2.5mm. The length of the rod and the length of the threaded connection part are designed according to the thickness of the construction wall and the required strength.

[0027] like Figure 2 As shown, an expansion water stop washer 7 is provided on the back side of the water stop plate 2, and a waterproof coating is filled between the expansion water stop washer 7 and the water stop plate 2. The waterproof coating is a polyurea elastomer waterproof coating, which can be more waterproof and anti-corrosive. The five-section water stop screw also includes a waterproof rubber sleeve 5 for sealing and supporting the template and a fastener 6 for fastening the template. The use principle of the waterproof rubber sleeve 5 is similar to the expansion tube of the expansion bolt. Figure 3 As shown, when the outer rod 4 is screwed in from the outside of the template, the outer rod 4 is spirally connected to the internal thread of the waterproof rubber sleeve 5. During the screwing process, the waterproof rubber sleeve 5 is squeezed and deformed toward the template side, sealing the screw hole between the outer rod 4 and the template while supporting the template, effectively preventing mortar leakage. The fastener 6 used includes a steel pipe 9 placed on the upper and lower sides of the outer rod 4, a mountain-shaped clamp 8 for fixing the steel pipe 9, and a fastening nut 10 for fastening the mountain-shaped clamp 8. Specifically, the fastening nut 10 is a hexagonal nut, and the mountain-shaped clamp 8 is a mountain-shaped clamp nut. The five-section water-stop screw forms a through-wall pull on the templates on both sides.

[0028] The construction method of the five-section water-stopping screw of the present invention comprises the following steps:

[0029] When constructing the exterior wall of the basement, arrange the steel bars according to the number and position of the steel bars in the drawings, and tie the steel bars with wire; then lay out the lines according to the thickness of the wall; according to the arrangement requirements of the screw holes, arrange the screws in the vertical and horizontal directions and draw lines on the template, and drill the screw holes. The diameter of the screw holes is equal to the maximum diameter of the five-stage water-stop screws, and ensure that the screw holes on both sides are aligned. Connect the connecting rod 3 to the main screw 1 respectively, and then partially cover the other end of the connecting rod 3 on both sides to form a whole component. After supporting one side of the template, place the connected whole component on the inside of the template, and screw the outer rod 4 from the outside of the template. The outer rod 4 is threadedly connected with the internal thread of the waterproof rubber sleeve 5, so that the waterproof rubber sleeve 5 squeezes the template to deform and fits tightly with the template, and the outer rod 4 penetrates the waterproof rubber sleeve 5 and is threadedly connected with the connecting rod 3; then support the template on the other side, the waterproof rubber sleeve 5 fits tightly with the inner wall of the template, and then install the outer rod 4 from the outside of the template. Use fasteners 6 to reinforce the templates on both sides, add two steel pipes 9 on the upper and lower sides of the outer rod 4, use mountain clamps 8 to clamp and fix the steel pipes 9, screw the hexagonal nuts 10 into the outer rod 4 and tighten the mountain clamps 8 to fasten the template. After the template is set up, pour concrete, and avoid the water stop screws during pouring to prevent them from shifting and deforming.

[0030] After the concrete pouring is completed, when the concrete strength reaches 50%, the formwork and waterproof rubber sleeve 5 are removed from bottom to top in sequence, and a special wrench is used to screw the outer rod 4 with the thread, and a torque in the same direction as the tightening direction of the outer rod 4 is applied; when the outer thread of the outer rod 4 is a right-hand thread, a torque is applied to rotate the outer rod 4 in the clockwise direction, so that the outer rod 4 is more tightly connected with the connecting rod 3, and at the same time, the threaded connection between the connecting rod 3 and the main screw 1 is released, and the outer rod 4 is pulled out to the outside of the formwork, and the outer rod 4 and the connecting rod 3 are recycled, leaving only the main screw 1 and the water stop 2 in the wall. Clean up the debris in the wall, fill the screw hole with micro-expansion waterproof mortar and compact it, and then apply the micro-expansion waterproof mortar to the protruding hole to form a gray cake. When the waterproof mortar on the outside of the screw hole solidifies, brush the cement-based penetrating crystalline waterproof coating around the hole as the center.

[0031] The economic benefit advantage of the five-section water-stop screw described in the present invention is calculated by taking a section of a building wall with a length of 55.6m and a width of 40.5m as an example. The outer dimensions of the standard section are 36.90m (width) × 16.43m (height), the design thickness of the main structure is 800mm, the template uses double-sided 1800mm×900mm×18mm thick bamboo plywood, and the reinforcement spacing of steel pipes and tension rods is 600mm×600mm.

[0032] Traditional water-stop screws were used, with a cost of 14 yuan per screw. A total of 5,000 screws were used, and the non-reusable parts cost 70,000 yuan. The template cost 130 yuan per sheet, and 2,255 sheets were used, with a loss rate of 33%, including a loss of 96,740 yuan.

[0033] The five-section water-stop screw described in the present invention is used. The cost of each of the five-section water-stop screws described in the present invention is 20 yuan / screw, and a total of 5,000 screws are used. The main screw is a non-reusable part, and the cost is 5 yuan / screw. The waterproof rubber sleeve needs to be recast. The outer rod and the connecting rod are reusable. The cost of the non-reusable part is 25,000 yuan, and the cost of recasting the waterproof rubber sleeve is 5,000 yuan. The template price is 130 yuan / sheet, and 2,255 sheets are used. The template loss rate is reduced by about 15% using the connection method in this article, of which the loss is 52,767 yuan. The comparison of the costs of each part is shown in Table 1:

[0034] Table 1 Construction cost comparison table

[0035]

[0036] Through the above comparison, it can be found that the construction cost of using the five-section water-stop screw described in the present invention can save 83,973 yuan, and the construction cost is significantly reduced.

Claims

1. A five-section water-stop screw, characterized in that: The invention comprises a main screw (1) with a water stop plate (2) fixed in the middle, a connecting rod (3) and an outer rod (4) being spirally connected in sequence on both sides of the main screw (1), and a waterproof rubber sleeve (5) for sealing and supporting the formwork and a fastener (6) for the formwork; both ends of the main screw (1) have external threads, the internal threads at both ends of the connecting rod (3) are in opposite directions, and the external threads of the outer rod (4) are in opposite directions to the external threads of the main screw (1).

2. The five-section water-stop screw according to claim 1 is characterized in that: The surfaces of the main screw (1) and the water stop plate (2) are provided with a waterproof coating.

3. The five-section water-stop screw according to claim 1 is characterized in that: The middle part of the main screw (1) is curved and arched upward.

4. The five-section water-stop screw according to claim 1 is characterized in that: The edge of the water stop sheet (2) is bent and extended toward the water facing surface.

5. The five-section water-stop screw according to claim 1 is characterized in that: A plurality of recessed portions are provided on one side of the water-facing surface of the water stop plate (2).

6. The five-section water-stop screw according to claim 1 is characterized in that: An expansion water-stopping gasket (7) is provided on the water-repelling surface of the water-stopping sheet (2), and a waterproof material is filled between the two.

7. The five-section water-stop screw according to claim 1 is characterized in that: The waterproof rubber sleeve (5) has an internal thread matching the outer rod (4).

8. The five-section water-stop screw according to claim 1 is characterized in that: The fastener (6) comprises a mountain-shaped clamp (8) for fixing the steel pipe (8), a steel pipe (9) and a fastening nut (10).

9. A construction method of the five-section water-stop screw according to claim 1, characterized in that: The following steps are involved: (a) Open screw holes on the template according to the screw hole arrangement requirements; (b) Connect the connecting rods (3) on both sides to the main screw rod (1) respectively, then partially cover the waterproof rubber sleeve (5) on the connecting rod (3), insert the outer rod (4) into the screw rod hole from the templates on both sides, penetrate the waterproof rubber sleeve (5) and connect with the connecting rod (3) by threading; (c) When pouring concrete, avoid the water-stop screw; (d) After the concrete strength reaches the required level, the formwork and the waterproof rubber sleeve (5) are removed, and a torque in the same direction as the tightening direction of the outer rod thread is applied to release the connection between the connecting rod (3) and the main screw rod (1); (e) Use micro-expanding waterproof mortar to seal the screw hole. When the waterproof mortar on the outside of the screw hole solidifies, apply cement-based penetrating crystalline waterproof coating around the hole.

10. The construction method of the five-section water-stop screw according to claim 9, characterized in that: When the concrete strength reaches 50% to 60% in step (d), demolition work starts from bottom to top.

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